html, body{ margin:0; height:100%; }
  #d1{
	  width:12%;
      height:100%;
      margin-left:auto;
      margin-right:auto;
      float:left;
      border:2px solid;
    	float:left;
      background-color:#454545;
}
		.el{
    max-height: 0;
    overflow: hidden;
    transition: max-height 1s;
    /*-webkit-transform: max-height 1s;*/
    /*background-color: ;*/
}
    #content{
    	width:88%;
      height:100%;
      float:left;
    }